Can you help me with #23? 3Lufa is the neane of a) Z-1-chloro-1-bromopropene b)
ID: 693098 • Letter: C
Question
Can you help me with #23?
3Lufa is the neane of a) Z-1-chloro-1-bromopropene b) E-1-chloro-1-bromopropene e) 2-1-bromo-1-chloropropene d) E-1-bromo-1-chloropropene CH 24. Which of the following structure is a meso structure? a) c) OH OH d) OH OH Cl Cl OH OH 25. What is the IUPAC of the compound shown below? a) (2R,3s) 2-Bromo-3-chloropentane HBr b) (2R,3R) 2-Bromo-3-chloropentane H (c))25,35) 2-Bromo-3-chloropentane d) (2S,3R) 2-Bromo-3-chloropentane Which would be the least stable alkene? a) hex-1-ene b) hex-2-ene c) 3-methylhex-3-ene d) 3-methylhex-2-ene 27. Which of the following terms best describes the stereochemical relationship of the two compounds shown below in Fischer notation? CH, CH, a) enantiomers ) diastereomers c) constitutional isomers d) cis/trans - isomers Br CH, 28. Which statement is correct one for the following reaction (R) 2-cyanobutane + (S) 2-cyanobutane (R) 2-Bromobutane + NaCN b) It is a S:2 reaction. The leaving group is cyanide. c) This is a Sn1 reaction. d) Elimination is the major reaction. of 2-bromo -2- 29. What type of intermediate is present in the sovolysis b) carbocation c) carbanion d) no intermediateExplanation / Answer
23)
on left side Br gets more preference because its molar mass is more than Cl
on right side -CH3 gets more preference
Since high preference group are on opposite side it is E isomer
numbering will start from left to right and since there are 3 carbon in main chain with double bond at 1st carbon, it is 1-propene
1-bromo comes before 1-chloro because of alphabetical ordering
the correct answer is d